CVE-2026-108714
7.5, highModelcontextprotocol kotlin-sdk Allocation of Resources Without Limits or Throttling Vulnerability
- CVSS
- 7.5, high high CVSS v3.1
- EPSS, next 30 days
- 0.4% higher than 27.9% of scored CVEs
- Exploitation
- No public evidence
- Published
- 11 Oct 20266 days ago
Description
MCP Kotlin SDK through 0.15.0 contains an uncontrolled memory allocation vulnerability that allows remote clients to exhaust server memory because Application.mcpWebSocket installs Ktor WebSockets without a maxFrameSize limit. Attackers can send small frame headers declaring payloads near 2 GiB over one or a few connections, forcing huge heap allocations and causing denial of service.
Details
- Vendor
- Modelcontextprotocol
- Product
- kotlin-sdk
- Weakness
- CWE-770 (opens in a new tab)
- Status
- Received
- Updated
- 11 Oct 2026
- Assigner
- disclosure@vulncheck.com
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References 5
Other references 5
- github.com /modelcontextprotocol/kotlin-sdk (opens in a new tab)
- github.com /modelcontextprotocol/kotlin-sdk/blob/0.15.0/kotlin-sdk-core/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/shared/WebSocketMcpTransport.kt#L60-L85 (opens in a new tab)
- github.com /modelcontextprotocol/kotlin-sdk/blob/0.15.0/kotlin-sdk-server/src/commonMain/kotlin/io/modelcontextprotocol/kotlin/sdk/server/WebSocketMcpKtorServerExtensions.kt#L41-L63 (opens in a new tab)
- hackmd.io /@haind/mcp-kotlin-sdk-websocket-frame-allocation-dos (opens in a new tab)
- vulncheck.com /advisories/mcp-kotlin-sdk-through-0.15.0-memory-exhaustion-via-application-mcpwebsocket (opens in a new tab)
The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.
Beyond this page
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Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.